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Here are some of the notes I took while reading the book: When you run an Xcode project from a standard (i.e., non-admin) user, you might be asked to enter credentials of a user in the “Developer Tools group.” You can fix this by adding the (current) user to the group: When you purchase something from the Mac App Store, you’ll see a little icon in your dock, but that doesn’t show you the percentage of progress.

If you try something similar with the computer (try leaving the semi-colon off in C or miss an indent in Python, for example), you’ll get a nasty error message.

This book your computer to work with the looser languages used by humans (like English) instead of the stricter counterparts used by machines.